|
Propeller selection
Hello, I have a 1993 16 foot Excel boat with a 1993 85 hp yamaha
outboard, and am looking to buy a propeller for it. Right now the boat has a 13.25" x 17" propeller on it and I don't have a tach but would guess the wot to be about 4500 to 4800 rpm, and the maximum rpm for this boat is 5500. I was considering switching to a four blade 13" x 15" propeller. The propeller I am looking at is from ql marine by Volvo Penta. Does anyone know anything about this brand, I've heard of Volvo Penta but never of QL. Also the boat typically is pretty loaded, usually near carrying capacity, a total weight of about 2500 pounds including the boat and engine. I want to switch props to make make towing easier but I also don't want it to over rev or sacrafice tons of top speed. The propeller I am looking at has the replacable hub and is made of aluminum, I am not interested in stainless steel because it is too expensive. So I would apreciate your opinions on wheter or not this is a good propeller for this boat. Thanks for your help. James |
Propeller selection
|
Propeller selection
You're working in the blind without a tach.
"JamesE" wrote in message ups.com... Hello, I have a 1993 16 foot Excel boat with a 1993 85 hp yamaha outboard, and am looking to buy a propeller for it. Right now the boat has a 13.25" x 17" propeller on it and I don't have a tach but would guess the wot to be about 4500 to 4800 rpm, and the maximum rpm for this boat is 5500. I was considering switching to a four blade 13" x 15" propeller. The propeller I am looking at is from ql marine by Volvo Penta. Does anyone know anything about this brand, I've heard of Volvo Penta but never of QL. Also the boat typically is pretty loaded, usually near carrying capacity, a total weight of about 2500 pounds including the boat and engine. I want to switch props to make make towing easier but I also don't want it to over rev or sacrafice tons of top speed. The propeller I am looking at has the replacable hub and is made of aluminum, I am not interested in stainless steel because it is too expensive. So I would apreciate your opinions on wheter or not this is a good propeller for this boat. Thanks for your help. James |
Propeller selection
On Jun 2, 8:37 am, "jamesgangnc" wrote:
You're working in the blind without a tach."JamesE" wrote in message ups.com... Hello, I have a 1993 16 foot Excel boat with a 1993 85 hp yamaha outboard, and am looking to buy a propeller for it. Right now the boat has a 13.25" x 17" propeller on it and I don't have a tach but would guess the wot to be about 4500 to 4800 rpm, and the maximum rpm for this boat is 5500. I was considering switching to a four blade 13" x 15" propeller. The propeller I am looking at is from ql marine by Volvo Penta. Does anyone know anything about this brand, I've heard of Volvo Penta but never of QL. Also the boat typically is pretty loaded, usually near carrying capacity, a total weight of about 2500 pounds including the boat and engine. I want to switch props to make make towing easier but I also don't want it to over rev or sacrafice tons of top speed. The propeller I am looking at has the replacable hub and is made of aluminum, I am not interested in stainless steel because it is too expensive. So I would apreciate your opinions on wheter or not this is a good propeller for this boat. Thanks for your help. James- Hide quoted text - - Show quoted text - Do you know of anywhere that I could buy or maybe rent a tachometer that I could just use temporarily? I know that I can install a tach but that costs about $100 and I was looking for a cheaper solution because I won't need it all the time, just to find out the wot rpm. Also if it helps the engine is a 3 cylinder two stroke outboard. Thanks. |
Propeller selection
On Jun 2, 11:15 am, John H. wrote:
On Sat, 02 Jun 2007 06:47:13 -0700, JamesE wrote: On Jun 2, 8:37 am, "jamesgangnc" wrote: You're working in the blind without a tach."JamesE" wrote in message roups.com... Hello, I have a 1993 16 foot Excel boat with a 1993 85 hp yamaha outboard, and am looking to buy a propeller for it. Right now the boat has a 13.25" x 17" propeller on it and I don't have a tach but would guess the wot to be about 4500 to 4800 rpm, and the maximum rpm for this boat is 5500. I was considering switching to a four blade 13" x 15" propeller. The propeller I am looking at is from ql marine by Volvo Penta. Does anyone know anything about this brand, I've heard of Volvo Penta but never of QL. Also the boat typically is pretty loaded, usually near carrying capacity, a total weight of about 2500 pounds including the boat and engine. I want to switch props to make make towing easier but I also don't want it to over rev or sacrafice tons of top speed. The propeller I am looking at has the replacable hub and is made of aluminum, I am not interested in stainless steel because it is too expensive. So I would apreciate your opinions on wheter or not this is a good propeller for this boat. Thanks for your help. James- Hide quoted text - - Show quoted text - Do you know of anywhere that I could buy or maybe rent a tachometer that I could just use temporarily? I know that I can install a tach but that costs about $100 and I was looking for a cheaper solution because I won't need it all the time, just to find out the wot rpm. Also if it helps the engine is a 3 cylinder two stroke outboard. Thanks. How about something like this: http://tinyurl.com/2ccvkl Cheap, will last forever, and can be used on your auto also.- Hide quoted text - - Show quoted text - How does that tach hook up? It looked like it determined the rpm based on the voltage of the charging system, so would that work on an outboard that doesn't have an alternator? I was also looking at the tiny tach. Would that work on a three cylinder? I also saw a cheap used yamaha tach on ebay so I'm going to keep an eye on that. Or I have heard that there is also tachs that work by pointing it at a rotating object. Are these accurate enough and could I just take the engine cover off and point it at the flywheel while someone else drives the boat at wot. Where would I get one of these type of tachs? |
Propeller selection
It most likely does hook to the ignition but I doubt it has a scale or
setting for your 2 stroke 3 cylinder. It probably has different scales for 4, 6, and 8 cylinder engines. A lot of people find a tach more useful that a speedometer in a boat. I drive by my tach, not my speedometer. I suggest you just get an real tach. You'll spend at least half of that to get a cheaper solution. Used or off ebay is fine. You really can't select the right prop until you actually know what rpm your engine is running at wot. "JamesE" wrote in message ups.com... On Jun 2, 11:15 am, John H. wrote: On Sat, 02 Jun 2007 06:47:13 -0700, JamesE wrote: On Jun 2, 8:37 am, "jamesgangnc" wrote: You're working in the blind without a tach."JamesE" wrote in message roups.com... Hello, I have a 1993 16 foot Excel boat with a 1993 85 hp yamaha outboard, and am looking to buy a propeller for it. Right now the boat has a 13.25" x 17" propeller on it and I don't have a tach but would guess the wot to be about 4500 to 4800 rpm, and the maximum rpm for this boat is 5500. I was considering switching to a four blade 13" x 15" propeller. The propeller I am looking at is from ql marine by Volvo Penta. Does anyone know anything about this brand, I've heard of Volvo Penta but never of QL. Also the boat typically is pretty loaded, usually near carrying capacity, a total weight of about 2500 pounds including the boat and engine. I want to switch props to make make towing easier but I also don't want it to over rev or sacrafice tons of top speed. The propeller I am looking at has the replacable hub and is made of aluminum, I am not interested in stainless steel because it is too expensive. So I would apreciate your opinions on wheter or not this is a good propeller for this boat. Thanks for your help. James- Hide quoted text - - Show quoted text - Do you know of anywhere that I could buy or maybe rent a tachometer that I could just use temporarily? I know that I can install a tach but that costs about $100 and I was looking for a cheaper solution because I won't need it all the time, just to find out the wot rpm. Also if it helps the engine is a 3 cylinder two stroke outboard. Thanks. How about something like this: http://tinyurl.com/2ccvkl Cheap, will last forever, and can be used on your auto also.- Hide quoted text - - Show quoted text - How does that tach hook up? It looked like it determined the rpm based on the voltage of the charging system, so would that work on an outboard that doesn't have an alternator? I was also looking at the tiny tach. Would that work on a three cylinder? I also saw a cheap used yamaha tach on ebay so I'm going to keep an eye on that. Or I have heard that there is also tachs that work by pointing it at a rotating object. Are these accurate enough and could I just take the engine cover off and point it at the flywheel while someone else drives the boat at wot. Where would I get one of these type of tachs? |
Propeller selection
On Sat, 02 Jun 2007 06:47:13 -0700, JamesE wrote:
On Jun 2, 8:37 am, "jamesgangnc" wrote: You're working in the blind without a tach."JamesE" wrote in message ups.com... Hello, I have a 1993 16 foot Excel boat with a 1993 85 hp yamaha outboard, and am looking to buy a propeller for it. Right now the boat has a 13.25" x 17" propeller on it and I don't have a tach but would guess the wot to be about 4500 to 4800 rpm, and the maximum rpm for this boat is 5500. I was considering switching to a four blade 13" x 15" propeller. The propeller I am looking at is from ql marine by Volvo Penta. Does anyone know anything about this brand, I've heard of Volvo Penta but never of QL. Also the boat typically is pretty loaded, usually near carrying capacity, a total weight of about 2500 pounds including the boat and engine. I want to switch props to make make towing easier but I also don't want it to over rev or sacrafice tons of top speed. The propeller I am looking at has the replacable hub and is made of aluminum, I am not interested in stainless steel because it is too expensive. So I would apreciate your opinions on wheter or not this is a good propeller for this boat. Thanks for your help. James- Hide quoted text - - Show quoted text - Do you know of anywhere that I could buy or maybe rent a tachometer that I could just use temporarily? I know that I can install a tach but that costs about $100 and I was looking for a cheaper solution because I won't need it all the time, just to find out the wot rpm. Also if it helps the engine is a 3 cylinder two stroke outboard. Thanks. How about something like this: http://tinyurl.com/2ccvkl Cheap, will last forever, and can be used on your auto also. |
Propeller selection
JamesE wrote:
On Jun 2, 11:15 am, John H. wrote: On Sat, 02 Jun 2007 06:47:13 -0700, JamesE wrote: On Jun 2, 8:37 am, "jamesgangnc" wrote: How about something like this: http://tinyurl.com/2ccvkl Cheap, will last forever, and can be used on your auto also.- Hide quoted text - But it won't work on his outboard. - Show quoted text - How does that tach hook up? It looked like it determined the rpm based on the voltage of the charging system, so would that work on an outboard that doesn't have an alternator? Your outboard has an alternator, so this is a non-issue when using a pulse sensing outboard tach. I was also looking at the tiny tach. Would that work on a three cylinder? I also saw a cheap used yamaha tach on ebay so I'm going to keep an eye on that. Or I have heard that there is also tachs that work by pointing it at a rotating object. Are these accurate enough and could I just take the engine cover off and point it at the flywheel while someone else drives the boat at wot. DON'T do this. VERY dangerous. Where would I get one of these type of tachs? It does not matter how many cylinders your outboard is. Outboard tachometers count the pulses of the alternator output, which is obviously directly dependent on crankshaft speed. You really should have a tach as standard equipment, before a speedometer even. When you get a tach, the instructions will have a chart to show how many alternator poles your particular outboard has. There is a switch on the backside to select the proper setting. Rob |
Propeller selection
|
Propeller selection
|
Propeller selection
On Jun 2, 11:51 am, trainfan1 wrote:
JamesE wrote: On Jun 2, 11:15 am, John H. wrote: On Sat, 02 Jun 2007 06:47:13 -0700, JamesE wrote: On Jun 2, 8:37 am, "jamesgangnc" wrote: How about something like this: http://tinyurl.com/2ccvkl Cheap, will last forever, and can be used on your auto also.- Hide quoted text - But it won't work on his outboard. - Show quoted text - How does that tach hook up? It looked like it determined the rpm based on the voltage of the charging system, so would that work on an outboard that doesn't have an alternator? Your outboard has an alternator, so this is a non-issue when using a pulse sensing outboard tach. I was also looking at the tiny tach. Would that work on a three cylinder? I also saw a cheap used yamaha tach on ebay so I'm going to keep an eye on that. Or I have heard that there is also tachs that work by pointing it at a rotating object. Are these accurate enough and could I just take the engine cover off and point it at the flywheel while someone else drives the boat at wot. DON'T do this. VERY dangerous. Where would I get one of these type of tachs? It does not matter how many cylinders your outboard is. Outboard tachometers count the pulses of the alternator output, which is obviously directly dependent on crankshaft speed. You really should have a tach as standard equipment, before a speedometer even. When you get a tach, the instructions will have a chart to show how many alternator poles your particular outboard has. There is a switch on the backside to select the proper setting. Rob Thanks for the replies guys. A tach would help me pick the best prop for the boat and would also help me keep a constant speed for towing so I think I will just spend the extra money and install a permanent tach. James |
| All times are GMT +1. The time now is 06:59 AM. |
Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Copyright ©2004 - 2014 BoatBanter.com